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2 vulnerabilities found for weechat by weechat
CVE-2026-53525 (GCVE-0-2026-53525)
Vulnerability from cvelistv5 – Published: 2026-08-21 22:19 – Updated: 2026-08-25 16:46
VLAI
EPSS
VEX
Title
WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication
Summary
WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue.
Severity
7.4 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 16:45 UTC
CWE
- CWE-208 - Observable Timing Discrepancy
Assigner
GitHub_M
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/weechat/weechat/security/advis… | x_refsource_CONFIRM |
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CVE-2026-53524 (GCVE-0-2026-53524)
Vulnerability from cvelistv5 – Published: 2026-08-21 22:18 – Updated: 2026-08-24 20:09
VLAI
EPSS
VEX
Title
WeeChat has a Decompression Bomb in Relay WebSocket (DoS)
Summary
WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 4.3.0 through 4.9.0, the WeeChat relay module's WebSocket permessage-deflate decompression function relay_websocket_inflate() has no upper bound on output size. An authenticated relay user can send a small compressed WebSocket frame (~100 bytes) that decompresses to gigabytes, exhausting all server memory and crashing the entire WeeChat process. The api protocol enables permessage-deflate and requires authentication before WebSocket upgrade. Version 4.9.1 patches the issue.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 20:09 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
GitHub_M
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/weechat/weechat/security/advis… | x_refsource_CONFIRM |
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